TTYNAME(3POSIX)

💖 TTYNAME(3POSIX) 💖

okay bestie, welcome to TTYNAME(3POSIX), straight out of the POSIX Programmer's Manual — yes, the whole POSIX Programmer's Manual, she's famous. ✨

---

🫶 PROLOG

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. so like, check ur local page too, mwah 💅

---

🌸 NAME

ttyname, ttyname_r — find the pathname of a terminal. literally her whole job. iconic behavior. 💖

---

✨ SYNOPSIS

#include <unistd.h>

char *ttyname(int fildes);
int ttyname_r(int fildes, char *name, size_t namesize);

---

🎀 DESCRIPTION

So the ttyname() function shall return a pointer to a string containing a null-terminated pathname of the terminal associated with file descriptor fildes. bestie, listen: the application shall not modify the string returned. The returned pointer might be invalidated, or the string content might be overwritten, by a subsequent call to ttyname(). The returned pointer and the string content might also be invalidated if the calling thread is terminated. 😭 so like, don't get attached, she's not yours forever.

The ttyname() function need not be thread-safe. no cap, that's just how she is.

The ttyname_r() function shall store the null-terminated pathname of the terminal associated with the file descriptor fildes in the character array referenced by name. The array is namesize characters long and should have space for the name and the terminating null character. The maximum length of the terminal name shall be {TTY_NAME_MAX}. 💫

---

🔥 RETURN VALUE

Upon successful completion, ttyname() shall return a pointer to a string. Otherwise, a null pointer shall be returned and errno set to indicate the error. a lil dramatic but okay.

If successful, the ttyname_r() function shall return zero. Otherwise, an error number shall be returned to indicate the error.

---

💀 ERRORS

The ttyname() function may fail if:

• EBADF — The fildes argument is not a valid file descriptor. girl that fd is not real 🙈
• ENOTTY — The file associated with the fildes argument is not a terminal. it's giving "not a tty", sorry babe.

The ttyname_r() function may fail if:

• EBADF — The fildes argument is not a valid file descriptor.
• ENOTTY — The file associated with the fildes argument is not a terminal.
• ERANGE — The value of namesize is smaller than the length of the string to be returned including the terminating null character. your buffer said "no room at the inn" 🫠

The following sections are informative. aka, the lore section, sit down, we're gossiping ✨

---

🌈 EXAMPLES

None. nothing. empty. she said "figure it out bestie" 💅

---

🦋 APPLICATION USAGE

None. again, nada. no tips, no tricks, no nothing.

---

💜 RATIONALE

The term terminal'' is used instead of the historical term terminal device'' in order to avoid a reference to an undefined term. rebranding, honestly. marketing team ate. 👑

The thread-safe version places the terminal name in a user-supplied buffer and returns a non-zero value if it fails. The non-thread-safe version may return the name in a static data area that may be overwritten by each call. so like... one shared notebook, everyone writing in it at once. chaos.

---

⭐ FUTURE DIRECTIONS

None. she's staying exactly like this, periodt.

---

🧚 SEE ALSO

The Base Definitions volume of POSIX.1‐2017, <unistd.h> go read her sister, iykyk 💖

---

👑 COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

---

okay that's the whole page bestie, you ate that. mwah! 💖✨

this has been brought to you by the fine folks at IEEE/The Open Group, 2017 edition — and yes, the manual name up top is TTYNAME(3POSIX), don't forget her name, she worked hard. 🎀🫶